Digital BW, The Print

Hi, everyone, I'd like to know how to make curve for the glop channel,
I'm using epson 2400 and qtr, with datacolor densitometer.
How can I properly limitate the glop?

In the second, 
I read about a spray that can be used after drying prints, and that
protect them (I'm talkin about glossy semi-glossy prints) and that can
be used in place of gloss, but is it usefull also to reduce bronzing
or is it just for protection?

thx a lot

hand

sab